Method of making pigments



Patented Dec. 22, 1931 UNITE STATES...

JOSEPH c. HECKMAN', or AvahoN,rENnsY va1vm" 1 METHOD or MAKINGVPIGMEN'IS No Drawing.

My invention relates to a product in the nature of a pigment for use asa rouge in the polishing of plate glass or other glass, jewelry, etc.,and as a pigment for the tint- 5 ing of paints, rubber, or othermaterials.

The invention contemplates the utilization of oxide of iron in themaking of the product hereinafter described and claimed.

As one source of the iron oxide, I may utilize a waste product such asthe iron sludge from chemical plants which make aniline oil through theuse of iron borings as a catalyst. The borings after they have been usedin the aniline process are in the form 5 of a sludge which is a magneticoxide of iron which has been heretofore discarded as waste material.This material is'particularly suitable for my purpose.

One object of my invention is to utilize a heretofore waste or discardedmaterial in the making of a commercially valuable product. 7

Another object of my invention is to provide a pigment or a rouge of thecharacter referred to which is of high quality and whose depth ofcoloringor tinting can be conveniently controlled or varied.

In the practice of my invention, I take an oxide of iron such as theiron sludge referred to and dissolve thesam e in sulphuric acid.

The percentage of sulphuric acid is varied in order to secure variousgrades of completed product, these grades having various strength ofcoloring or tinting capacity. A

given quantity of sulphuric acid will more completely dissolve the ironthan a smaller quantity thereof and therefore produce a pigment having astronger body. A sufiioient quantity of water will be incorporated with49 the other ingredients to secure effective mixing thereof.

The brilliancy of the completed product may be enhanced to a desireddegree by the use of a small percentage of dissolved salts of soda, suchas so-diumsulphate, sodium chloride, sodium carbonate or the like, inconjunction with the oxide of iron and the'sulphuric acid, the saidconstituents being of course varied according to the'brilliancy de- 59sired.

Applicationfiled February 6, 1929 Serial No. 338,036." i 7' llAfter theconstituentshave been thorough ly mixed together, the mixture is thendried,

thus producing'a sulphate of iron-y."lh'ereafter the mixture is removedfrom thekettl 'e or vat in which it has been prepared'and placed in acalcining furnacewhere: itffis roasted at about "1500" R'to produce anoxide i of iron of the desired brilliant red color and strength.

pleted, the mixture is washed in waterto re move therefrom those acidremnantsfwhich. have not been driven off by the h'eat du ring thecalcining'operation, and the; material is then dried and finely ground.Thereupon I 1 it is ready for use either .as rouge or f coloringpigment, asabOve-stated. "lil'i' 3Ogallonsofwater.

mixture, such mixture mayconsist of j I lton oxide'of iron or drysludge;1 ton 60 Sulpllul'iCiabld. l

30 gallons of Water. I 20 to 200 lbs. of soda;

" Where a soda istobe incorporated inthe In preparing the lattermixture, the water and soda are placed with the iron and v the sulphuricacid added whereupon the mix-' ture is stirred until it becomes sue. Itis then ready to be dried and calcined as aboveexpl'ained. r I In themaking'of rouge the color is not important, and the soda may be omitted,but the'product wherein the soda is'included, Q

After the roastingoperation has'beeneom 1 As heretofore indicated, theproportions $1200 I 15 resulting oxide.

of the Various ingredients may be altered to a considerable extentwithout departing from the spirit and scope of the invention as definedin theaccompanying claims.

5 While the invention is hereinafter referred to as a pigment, I employthe word'pigment in a broad sense, and not as limited to simplyacoloring or tinting agent. "1

' I claim as'my invention I r 1. The method which comprises treating aniron sludge' with sulphur acid and sodiumchloride to produce a sulphateof iron,

calcining the resulting product to produce a ferric oxide and thereafterpulverizing the 1 '2. The method wh ieh comprises mixing water'and'sodium chloridewith an oxide of ,ironfsubjecting said Imixture .tothe action of sulphuricv acid, and thereaftercalcining 12o the-productto produce-a ferric oxide ofbrilliant redcolor. v

v 3. Themethod Which-comprises treating a magnetic iron oxide withsulphuric acid v and sodium chloride to produce a sulphate '25 ofiiron,and calciningthe resultant product at a temperature Whichwill produce, aferric oXideofIa-strong brilliantlred color.

;-.4.- The -method which comprises treating.

oxide-of iron with sulphuric acid and ,sovdi-.

um chloride, to producea sulphate ofiron,

' after grinding the product.

calcining the mixture at a-temperature which will producean oxide. ofironof brilliant red color, Washing the resulting product toremovenacidcremnants therefrom, and there- 5. The method Which comprisestreating V oxide of iron with sulphuric acid in the presence of a.compound'selected from the group 7 consisting of sodiumsulphate,sodiuinchlo- 0 ride and sodium carbonate, .to producea sul- .phate ofsiron, and thereafter calcining'the resulting'product atatemperatureof-ap proximately VI5QO F; to produce a :ferric oxide of brilliant.redcolor.

V In testimony whereof 'I, the said JOSEPH C. HEOKMAN have hereuntosetmy hand.

' JOSEPH C. HECKMAN.

